LOCATION LAFOLLETTE OREstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, mesic Vitritorrandic Haploxerolls
TYPICAL PEDON: LaFollette ashy sandy loam - cropland, on a nearly level terrace at 2700 feet elevation. (When described (6/4/85), the soil was dry throughout. Colors are for dry soil unless otherwise noted.)
A1--0 to 6 inches; brown (10YR 5/3) ashy sandy loam, very dark brown (10YR 2/2) moist; weak fine granular structure; slightly hard, friable, nonsticky and nonplastic; common very fine roots; common very fine irregular pores; 10 percent (estimated) clay; neutral (pH 6.8); abrupt smooth boundary. (4 to 10 inches thick)
A2--6 to 24 inches; brown (10YR 5/3) ashy sandy loam, very dark grayish brown (10YR 3/2) moist; weak medium subangular blocky structure; slightly hard, friable, nonsticky and nonplastic; few very fine roots; few very fine irregular pores; 10 percent gravel; 10 percent (estimated) clay; neutral (pH 6.8); clear wavy boundary. (5 to 20 inches thick)
2AC--24 to 35 inches; pale brown (10YR 6/3) very gravelly sandy loam, dark yellowish brown (10YR 4/4) moist; moderate fine subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; few fine tubular pores; 40 percent rounded gravel; 10 percent (estimated) clay; neutral (pH 7.0); clear wavy boundary. (7 to 12 inches thick)
2C1--35 to 42 inches; pale brown (10YR 6/3) matrix with multicolored sand particles (10YR 6/2, 7/1, 5/3) very gravelly sandy loam, dark yellowish brown (10YR 4/4) moist; massive; hard, friable, slightly sticky and slightly plastic; 55 percent rounded gravel; 10 percent (estimated) clay; neutral (pH 7.0); abrupt smooth boundary. (0 to 7 inches thick)
3C2--42 to 60 inches; dark gray (10YR 4/1) matrix with multicolored sand particles (10YR 6/2, 7/1, 5/3) extremely gravelly loamy coarse sand, black (10YR 2/1) moist; 80 percent rounded gravel, 10 percent rounded cobbles; neutral (pH 7.0).
TYPE LOCATION: Deschutes County, Oregon; 300 feet east of gravel road off of Lower Bridge Road, northwest quarter of the northeast quarter of section 19, T. 14 S., R. 12 E. (Latitude 44 degrees, 20 minutes, 57 seconds N, Longitude 121 degrees, 20 minutes, 10 seconds W)
RANGE IN CHARACTERISTICS: The soil moisture control section is usually dry and is dry in all parts for 120 to 150 days (cumulative). The mean annual soil temperature is 48 to 52 degrees F. Depth to bedrock is 60 inches or more. The upper mantle (depth to the discontinuity 2AC horizon) is 20 to 30 inches thick. The upper mantle contains 15 to 30 percent volcanic glass and glass-coated aggregates, a phosphate retention of 15 to 25 percent and an acid oxalate aluminum plus one-half the acid oxalate iron of 0.40 to 0.80 percent. The mollic epipedon is 10 to 15 inches thick. Base saturation is 80 to 100 percent. It is neutral throughout. The particle-size control section averages 20 to 35 percent rock fragments with the upper part containing less than 15 percent and the lower part containing 35 to 60 percent. The upper part of the particle-size control section contains 50 to 70 percent fine sand or coarser.
The A horizon has hue of 10YR, value of 2 or 3 moist and 5 dry and chroma of 2 moist and 3 dry. It contains 0 to 10 percent gravel and 5 to 10 percent clay (estimated).
The 2AC horizon has hue of 10YR, value of 4 moist and 6 dry and chroma of 3 moist and 4 dry. It contains 35 to 60 percent gravel and 5 to 10 percent clay (estimated).
The 2C and 3C horizon has hue of 10YR, value of 2 to 4 moist and 4 to 6 dry and chroma of 1 to 4 moist and dry. The upper portion of the C horizon contains 35 to 60 percent gravel and 5 to 10 percent clay and the lower part contains 60 to 80 percent gravel and 0 to 5 percent clay.
In some pedons, there is a thin layer of welded tuff between the 2AC and the 2C horizons.
COMPETING SERIES: These are the Deschutes and Houstake Series. Deschutes soils are 20 to 40 inches deep to bedrock. Houstake soils are typically sandy loam throughout and lack the skeletal substratum material above a depth of 40 inches.
GEOGRAPHIC SETTING: The LaFollette soils are on old river terraces at elevations of 2,500 to 2,800 feet. Slopes are 0 to 8 percent. The soils formed in ash over old alluvium. The climate is characterized by cool, moist winters and hot, dry summers. Mean annual precipitation is 10 to 12 inches. The mean annual temperature is 47 to 52 degrees F. The frost-free period is 70 to 100 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Buckbert, Stukel and the competing Deschutes soils. Buckbert soils are in swales on uplands and are fine-loamy. Stukel soils are on lava plains and are shallow to bedrock.
DRAINAGE AND PERMEABILITY: Well drained; moderately rapid permeability.
USE AND VEGETATION: These soils are used for irrigated crops, hay, pasture, livestock grazing and wildlife habitat. Potential native vegetation is western juniper, mountain big sagebrush, antelope bitterbrush, Idaho fescue, and needleandthread.
DISTRIBUTION AND EXTENT: Deschutes Basin of central Oregon, MLRA 10. The series is not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Deschutes County (Upper Deschutes River Area), Oregon, 1992.
REMARKS: Diagnostic horizons and features in the pedon are:
mollic epipedon - from the soil surface to about 12 inches; (A1 and part of the A2 horizons) mollic colors extend to greater depths but organic matter is less than one percent.
Vitritorrandic - Laboratory data based on the associated Deschutes Series, pedon S87OR-017-002. The very fine sand fraction contains about 19 percent glass and glass-coated aggregate, phosphate retention is about 17 percent and acid oxalate aluminum plus one-half the iron is 0.50 percent.
Particle-size control section - (10 to 40 inches)) - the 10 to 24 inch zone contains about 58 percent fine sand or coarser and the control section averages 28 percent rock fragments.
The ash material is from Mt. Mazama.
The 2AC and 2C, 3C material is unconsolidated alluvium from the Deschutes Formation.